Spark-plug



'M. M. MCCOY.

SPARK PLUG.

APPLICATION FILED DEC. 7,1916.

Patentd Nov. 1, 1921.

the various types UNITED STATES 4 MARION m; McCOY, or DAWSON, NEW mExIco, ASSIGNOR or ONE-HALF or sr. LOUIS, MISSOURI;

PATENT oFFicE.

TO G. A. WILL,

srAax-rmre.

Specification of Letters Patent.

Patented Nov. 1, 1921.

Application filed December 7, 1916. Serial No. 135,604.

To all whom it may concern:

Be it known that I, MARION M. MCCOY, a citizen of the United States, residingat Dawson, county of Colfax, State of New Mexico, have invented a certain new and usefulImprovement in Spark-Plugs, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had ,to the accompanying drawings, forming part of this specification.

My invention relates to spark plugs for internal combustion engines, the principal object of my invention being to rovide a spark plug with an attachment w ich performs the functions of a blow-out valve and a priming device, said. attachment being very simple in structure, effective in use and adapted to be combined with practically all of spark plugs now in general use. a

A further object of my invention isto provide means for simultaneously opening and closing the entire series of combined blow-out valves and priming devices applied to an engine, thereby making it possible for the driver of the motor vehicle, from his position on the vehicle seat to effect the blowing out of carbon and the like from the engine cylinders while said engine is in operation.

With the foregoing and other objects in 'view, my invention consists in certain novel features of construction and arrangement of parts, hereinafter'more fully described and claimed and illustrated in the accompanying drawings, in which- I Figure 1 is a plan View of an'internal ing drawings, which illustrate a practical embodimentof my invention, 10 designates the body of the spark plug, the same being "provided at its lower end with an extension 11 which is externally threadedin order that said extension may be screw seated in the wall of an internal combustion engine.

The body 10 and extension 11 are provided with a common chamber 12, the lower end of which terminates in a restricted o ening 13 in the, bottom of extension 11. eated in the bottom of the extension 11 and projecting into the restricted opening 13 is an electrode or spark point 14.

Screw seated in the upper end of the body 10 is a plug 15 the same carrying a substantially cylindrical member 16 of insulation and carried by said member is an electrode or spark point 17, the lower end of which terminates adjacent to the end of member 14.

Chamber 12 is comparatively large and I as the lower portion 0 member 16 extends only a short distance downward into the upper portion of said chamber, the latter is comparatively free or open and devoid of narrow pockets or recesses, which latter, it will be understood, tend to collect carbon and the like. The tendency of carbon and the like to enter this comparatively large open chamber is materially reduced by the restricted opening into the lower portion of said chamber, and which opening is partially closed by the ends of the electrodes 14 and 17.

Screw seated in the wall of the body 10 is one end of a tubular member 18, the same performing the functions of a Valve housing portion of this member 18 is a diametrically arranged tapered aperture 20 and mounted for rotation therein is a tapered plug 21, the same being provided with an aperture 22 which is adapted to coincide with the passageway through said member 18. Under normal conditions, this plug is turned so that the aperture 22 is at right angles or out of register with the passageway through the member 18 and when said plug is turned so that said aperture registers with the passage-' way, carbon and like accumulation within the engine cylinder will find exit upwardly through chamber 12 and thence outwardly through the passageway in-member 18, or in the event that it is desired to prime the cylinder, the priming fluid may be poured into; cup-shaped membier 19,.and said fluid will pass from thence through the spark plug into the cylinder.

In order to effect the simultaneous opening and closing of all of the spark plugs utilized on a multi-cylinder engine, I have arranged an apparatus comprising a rod 23 from which projects a series of short arms 24, and the ends of thelatter are pivotally connected to the outer ends of fingers 25, the same being fixed to the projecting ends of the plugs 21.

One end of the rod 23 is connected to a retractile spring 26, thesame normally holding said rod 23 in position with all of the valves closed. The opposite end of rod 23 is pivotally connected to one end of a lever 27 preferably in the form of a bell crank, and the opposite end of said lever being connected in any suitable manner to a pedal or lever which is located convenient to the seat occupied by the driver of the vehicle.

In the event that it is desired to eiiect the discharge of carbon or other accumulation within the cylinders of the engine to which plugs are applied, the lever or pedal is actuated to operate lever 27, thereby shifting rod 23 lengthwise, and through the connections 24 and 25 all of the plugs are partially rotated so as to bring the apertures 26 into re ister with-the passageway through the mem ers 18, and while the engine is running, the carbon or otheraccumulations within the cylinders will be blown outwardly through the spark plugs and through the passageways through the members -18. The electrodes form the spark gap in the restricted mouth of the chamber 12 and in the blowing out operation, above described, any carbon which might accumulate on the electrodes or inthe chamber 12 will be in the path of the air and burnt gases expelled from the cylinder through the restricted mouth of chamber 12 (at the bottom thereof) and through the opening in tube 18 (at the top of chamber 12) and thus-the electrodes and chamber 12 will be cleaned.

As soon as the pull upon the lever 27 isreleased, spring 26 will act to return rod 23 and parts connected thereto to their normal positions, thereby simultaneously closing all of the valves connected to the spark plugs.

Spark plug attachments of my improved construction are comparatively simple, can be readily combined with practically all forms of spark plugs now in general use, and provide effective means for permitting the accumulations within the cylinders of an engine to be blown out while the engine is in operation, and likewise provide simple means whereby the cylinders may be easlly and quickly primed.

It will be readily understood that minor changes in the size, form and construction of the various parts of my improved spark plug attachment can be made and substituted for those herein shown and described, without departing from the spirit of my invention, the scope of which is set forth in the appended claim.-

cla1m:

The combination with a multi-cylinder internal combustion engine, of a series of spark plugs seated in the cylinder block of the engine with one spark plug projecting into each cylinder of the engine, each of which spark plugs comprises a body that is provided with a comparatively large chamber having a restricted opening at its lower end, an electrode fixed to the body of the spark plug and projecting into said restricted opening, a second electrode extending through the body of the spark plug and insulated therefrom, the lower end of 'which second electrode terminates within the side wall of the plug, which aperture v communicates with the chamber, of a tubular member one end of which is threaded and screw seated in the aperture in, the plug, the outer end of said tubular member being turned upwardly and formed into a cup which is open to atmosphere, a valve mounted for rotation within said tubular member and passing diametrically therethrough, said valve being provided with an aperture which is adapted to register with the passageway through the tubular member, an operating handle carried by each valve, a pull-rod pivotallv connected to the outer ends of all of said handles, and a retractile spring for moving said pull rod i'n M. P. SMITH, M. A. HANDEL. 

